Prediction Markets Are Crushing It During March Madness, and Kalshi Just Proved It

The NCAA basketball tournaments just became a cash machine for Kalshi, the prediction market platform, and the numbers are absolutely wild. From March 16 through April 6, Kalshi processed nearly $10 billion in total volume across all betting categories and made more than $100 million in fees. That breaks down to an average of $4.7 million per day in fees alone. For context, that's the kind of money that makes a sportsbook sit up and take notice.

College Basketball Drove the Action

College hoops was the star of the show. Across the entire men's and women's NCAA tournaments, Kalshi pulled in $28.5 million in fees on $2.18 billion in volume on non-parlay bets. That represented 22.9% of the platform's total $9.52 billion in volume during the three-week stretch. Add in another $1.91 billion that came through parlay bets, and you're looking at serious money flowing through these markets.

The early rounds were absolutely insane. When the tournament kicked off with 48 games over four days, Kalshi saw more than $1 billion in college basketball volume. That day ended up being the platform's second-biggest trading day ever. Even the championship games brought serious action. The men's championship game alone attracted $89.3 million in volume after the Final Four semifinals ended, with bets covering everything from the winner to the spread and total. The women's championship game pulled $14.3 million in volume after the semis, bringing its season-long total to $18.3 million.

The Tournament's Impact on the Whole Platform

Here's the thing that really shows how massive this tournament was: volume on college basketball quintupled year-over-year compared to 2025. That's not a small bump. That's a complete transformation. The Final Four weekend alone generated $283.4 million in college basketball volume, which earned Kalshi $4.1 million in fees over those few days.

The biggest individual men's tournament games outside the Final Four included UConn's Elite Eight victory over Duke, Duke's first-round comeback win over 16-seed Siena, and Arizona's Elite Eight win over Purdue. Every marquee matchup brought traders to the platform, and the volume kept climbing.

If this is what March Madness looks like now, don't be surprised if prediction markets become as much a part of the tournament experience as the games themselves.

This article was created with AI assistance and reviewed by Seattle On Tap editorial staff. Always verify information with official team sources.